Lab: fix: extension npm packages fail to resolve in compiled binary

Description

Since #611 (--external npm:*), extension models that import npm packages (e.g., @john/k8s importing npm:@kubernetes/client-node@1.0.0) fail when run from the compiled swamp binary:

Warning: Failed to load user model k8s/configmap.ts: TypeError: Could not find constraint '@kubernetes/client-node@1.0.0' in the list of packages.

This affects ALL extension npm packages except npm:zod (which is in swamp's own dependency graph).

Root Cause

Two conflicting deno bundle failure modes:

CJS interop (#609): When npm packages are INLINED, CJS-dependent packages (e.g., @aws-sdk/client-s3 → tslib) break with import_tslib.default is undefined. This was fixed by #611 externalizing all npm packages.
Compiled binary resolution: When npm packages are EXTERNALIZED (--external npm:*), the compiled binary can't resolve packages not in its embedded dependency graph. This is the current regression.

Proposed Fix

Only externalize npm:zod — revert --external npm:* to --external npm:zod@4 --external npm:zod. All other npm packages get inlined by the bundler, which works in compiled binaries.
Ban dynamic imports — the CJS interop issue (#609) was triggered by await import("npm:@aws-sdk/client-s3@3"). Add validation during extension push to reject dynamic import() calls with a clear error. Static top-level imports are handled correctly by deno bundle.
Update skill docs — guide extension authors to use static imports only.

Impact

Fixes @john/k8s and any extension using npm packages from compiled binary
Prevents future CJS interop issues by rejecting the problematic pattern at push time
No new runtime requirements (bundles remain self-contained)
Extensions using dynamic imports will need to convert to static imports

#609 — Bundler breaks tslib CJS/ESM interop for dynamic imports
#611 — Externalize all npm packages in extension bundler (introduced this regression)

yep yep yep

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After today upgrade

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consider a libswamp

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fix: extension npm packages fail to resolve in compiled binary

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